For each tracer, two images are delivered. One is not corrected for the primary beam, while the other image is corrected for the primary beam (labeled with 'pbcor').
Images not corrected for the primary beam are typically used for mapping structure, while those corrected for primary beam are typically used for measuring accurate fluxes.

The format for each image data cube in a MASSES dataverse is:
[targetname].[configuration].[linename].cube.fits
[targetname].[configuration].[linename].cube.pbcor.fits

The format for each continuum image in a MASSES dataverse is: 
[targetname].[configuration].cont[wavelength].fits
[targetname].[configuration].cont[wavelength].pbcor.fits

In the first MASSES data release (Stephens et al. 2018), the SMA configuration is in the subcompact (sub) array. The delivered spectral lines are 12CO21, 13CO21, C18O21, and N2DP. High velocity CO (highvelCO) is delivered for ASIC data. The continuum is at 1.3 mm.
Chunk s13 for Track 151019 is missing, and thus there is no high velocity CO cube. However, high velocity CO data is present in the 12CO21 cube.

For Per-emb-44 and SVS 13B, there are two tracks, which were combined when imaging.
Track 151019 was taken with the ASIC correlator.
Track 170127 was taken with the SWARM correlator.
To import a fits image into miriad, the "fits" task should be used. "op=xyin" should be specified. We show an example for CO(2-1) below:
fits in=Per44SVS13B.sub.12CO21.cube.fits out=Per44SVS13B.sub.12CO21.cube op=xyin

While casa can directly handle fits image files, to import the file into casa format, the task importfits can be used:
importfits(fitsimage="Per44SVS13B.sub.12CO21.cube.fits",imagename="Per44SVS13B.sub.12CO21.cube")
